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3 years ago

Black holes are formed when stars lose gas to burn, form a red super giant, cool down, then becomes so dense-?

Physics

1 answer:

ruslelena [56]3 years ago

3 0

Answer:

D the star explodes

Explanation:

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67.345g rounded to the nearest 1.0 whole number

inessss [21]

Look at the tenths place.
If it's less than 5, round down.
If it's greater than 5, round up.
If it's equal to 5. look at the next digit and round that to see if you should round up or down. Then, if it's the last digit, round up.

3 is less than 5, so round down.

67 - 1 = 66 grams.

8 0

4 years ago

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What is the name of type of relationship that exists between wavelength and frequency ?

arsen [322]

Electromagnetic is the relationship exists between wavelength and frequency.

8 0

3 years ago

Problem #3: 3.6. A diode has wdo = 0.4 µm and φj = 0.85 V. (a) What reverse bias is required to triple the depletion-layer width

Alchen [17]

Answer:

a) 6.8 Volt

b) 1.21Цm

Explanation:

We are given from the question that

The zero -bias depletion layer width( $W_{do}$ ) is 0.4Цm

The built in voltage φj is 0.85V

Now to calculate the reverse voltage( $V_{R}$ ) that would be required to triple the depletion - layer width.

The depletion - layer width ( $W_{d}$ ) of the diode has the formula

$W_{d} = W_{do} \sqrt{1 + \frac{V_{R} }{Qj} }$

For three times of $W_{d}$ we have

$3W_{d} = W_{do} \sqrt{1 +\frac{V_{R} }{Qj} }$

=> $\frac{V_{R} }{Qj} = 3^{2} -1$

=> $V_{R} = 8Qj$

Substituting value of φj

We have

$V_{R} = 8(0.85V)$

= 6.8 V

The required bias voltage $V_{R}$ is 6.8 V

The solution for the b part of the question is uploaded on first image

7 0

3 years ago

Will a series circuit work if there are two batteries and one light bulb? Help asappp please!

Dmitry_Shevchenko [17]

Answer:

Doubling the voltage in this arrangement both doubles the voltage drop across the resistor and the current through it. The bulb will be much brighter.

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3 years ago

Which temperature scale has no negative temperatures A. Celsius B. Joule C. Fahrenheit D. Kelvin

Brilliant_brown [7]

The Kelvin scale has no negatives on it.

Zero Kelvin is 'Absolute Zero', and nothing can get colder than that.

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3 years ago

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